Gear-cutter attachment for lathes.



v A.BERGERON. GEAR CUTTER ATTACHMENT FOR LATHES. APPLICATION FILED DEC. 18, 1912.

LMSA %m Patented July 14, 1914.

2 SHEETS-SHEET 2.

Inventor Attorneys ARTHUR BERGERON, OF IBONWO OD, MICHIGAN.

GEAR-CUTTER ATTACHMENT FOR LATHES.-

Specification of Letters Patent.

Patented July 14, 1914.

Application filed December 18, 1912. Serial No. 737,542.

T 0 all whom it may concern Be it known that I, ARTHUR BERGERON, a citizen of the United States, residing at Ironwood, in the county of Gogebic and State of Michigan, have invented a new and useful Gear-Cutter Attachment for Lathes, of which the following is a specification.

The device herein disclosed is an attachment for a turning lathe, and is adapted to be employed for cutting teeth in gears.

One object of the present invention is to provide novel means for mounting for slid ing movement, the carriage which supports the gear-blank, during the cutting operation.

Another object of the invention is to provide novel means for actuating the carriage so that the cutting tool will incise the teeth in the gear-blank.

The invention aims, further, to provide novel means for adjusting the positions of the supplemental stocks uponthe carriage. It is within the scope of the invention to provide novel means for adjusting the position of the work upon the supplemental stocks.

Another object of the invention is to improve generally and to increase the utility of devices of that type to which the present invention appertains.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in thedetails of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of invention can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing :-Figure 1 shows the invention in elevation; Fig. 2 is a top plan of the carriage; Fig. 3 is a plan of the clamp which is assembled with the center of one supplemental stock; Fig. 1 is an elevation of the tail stock; Fig. 5 is an elevation of the auxiliary stock with which one end of the carriage is slidably connected; Fig. 6 is a transverse section showing a portion of the carriage, the supplemental stocks being mounted thereon; Fig. 7 is an elevation of one of the supplemental stocks shown in Fig. 6; Fig. .8 is a plan of the cross bar which connects the constituent portions of the tail stock; Fig. 9 is a transverse section of the element shown in Fig. 8; Fig. 10 is an elevation showing the relative positions of a pair of gear wheels whereby the gearblank is rotated, to present successive portions thereof to the action of the cutting tool; Fig. 11 is a sectional detail illustrating the mechanism for advancing one of the centers; Fig. 12 is a fragmental perspective, illustrating the means whereby the blank which is to be cut is operatively connected with one of the centers. 1

In the present invention, the gear-blank is mounted between a pair of supplemental stocks, the stocks beingadjustable longitudinally of a carriage which is mounted to slide transversely of the bed of the lathe, the carriage being supported by the tail stock of the lathe and by an auxiliary stock which is located between the head stock and the tail stock. Slidingmovement is im parted to the carriage by mechanism mounted upon the auxiliary stock, said mechanism being driven from a shaft which is journaled in the head stock and in the tail stock of the lathe.

1n the drawing, the numeral 1 indicates generally, the bed of a turning lathe, the numeral 2 denoting the head stock and the numeral 3 denoting the tail stock.

Referring to Figs. 1 and 1, the tail stock 3 comprises a pair of posts 4 having grooves 5 adapted to receive the shears 6 of the lathe bed 1. A rod 7 connects the posts 4:, and bolts 8 are provided, the same having heads 9 which are adapted to slide along the rod 7. Set screws 10 threaded into the heads 9 engage the rod 7 to hold the screws 8 in adjusted positions along the rod. The screws 8 extend downwardly through a clamp bar 11, shown in Fig. 1, the clamp bar 11 being adapted to engage the lower face of the bed 1. Nuts 12 are applied to the lower ends of the bolts 8 and serve to bind the clamp bar 11 against the bed 1, the construction being such that the tail stock 3 may be adjusted along the shears 6. 'ihe posts 4 are connected by a right and left screw 14. In the posts 4: are fashioned openings 15, receiving for vertical adjustment, ides 16 terminated in wedge-shaped heads 1 engaged in a dovetailed recess 18 formed in a cross bar 1-9, the construction being such that the cross bar may be adjusted transversely of the tail stock 3. Intermediate of its ends, the cross bar 19 is provided with a lug 20 in which is located a center 21. -An ad usting screw 22 is threaded into the lug 20 and may be employed for advancing and retracting the center 21. Screws 23 are threaded into the guides 16 and extend across the openings 15, the screws 23 being held in the posts 4 for rotation but against longitudinal movement. The upper ends of the screws 23-carry beveled pinions 24 meshing into beveled pinions 25 secured to a shaft 26 which is journaled in bearings 27 carried by the upper ends of the posts 4. .As will be understood readily, when rotation is imparted manually to the shaft 26, the pinions 25 and 24 will rotate the screws 23, the screws 23 serving to raise and lower the cross bar 19, the cross bar carrying, in its movement, the center 21.

The afore mentioned vertical adjustment of the center 21 serves to line u a drive shaft. 29, one end of which'is earned by the center 21, and the other end of which is journaled in a bushing 28 carried by the head stock 2. That end 30 of the drive shaft 29 which is adjacent the head stock 2 may be provided with any of the common and well known appliances, usually met with in turning lathes, whereby rotation and a reversal in the direction of rotation may be im arted to the shaft 29.

oting Figs. 1 and 5, the invention includes an auxiliary stock which is denoted generally by the numeral 31. The auxiliary stock 31 comprises 33 adapted to receive the shears 6. The posts 32 are connected by a right and left screw 34. Mechanism is provided for securing the auxiliary stock 31 adjustably to the bed 1 of the lathe,and this mechanism is indicated generally by the reference character 35. The structure indicated at 35 need not be described in detail, referenc being had to the parts 7, 8, and 11 hereinbefore described which are of similar construction.

One of the posts 32 of the auxiliary stock 31 is provided with a fixed lower bearing 36 in which is journaled and held against longitudinal movement, a transverse lead screw 37. To one end of the lead screw 37 is secured a beveled pinion 38, meshing into a beveled pinion 39 carried by the lower end of a longitudinally extensible shaft 40, the constituent parts of which are united for simultaneous rotation, but for independent sliding movement, b a clutch 41. The upper end of the sha t 40 is journaled in a bearing bracket 42, adapted to slide in guides 43 formed upon the post 32. The bearing bracket 42 is held in ad'usted positions by means of screws 44 or t e like which pass through the bracket and engage the adjacent post 32. Another bearing bracket 45 is similarly mounted for vertical adjustment upon the other post 32. In the brackets 42 worm wheel 49 and the worm 50 may posts 32 having grooves and 45 is journaled a transverse shaft 46,

wheel 49 driving the shaft,46,and the shaft 40 through the medium of the intermeshing beveled pinions 47 and 48. When the shaft 40 is rotated, the same will impart rotatory movement-t0 the lead screw 37, through the means of the intermeshing beveled pinions 38 and 39. The engagement between thle be a justed by moving the bearing brackets 42 and 45 vertically upon the respective posts 32. The utility of the vertical adjustment for the shaft 46 as shown in Fig. 5 resides in the fact that by vertically adjusting the shaft 46 the mesh between the worm 50 and the worm wheel 49 may be regulated. hen rotatory movement is imparted to the lead screw 37, in the manner hereinbefore set forth, the same serves to actuate a carriage 54, the construction of which will be described in detail hereinafter.

If desired the "clutch 41 may be manipu lated to disconnect the parts of the shaft 40, whereupon the carriage 54 may be retracted by applying a crank to the squared end of the shaft 37 Extended transversely of the bed 1 of the lathe and secured as indicated at 51 to the auxiliary stock 31 and to the tail stock 3, are tracks 52 which support the carriage 54. The carriage 54 comprises end bars 55 and side bars 53, the side bars 53 being grooved as shown at 53, transversely, and the end bars 55 being grooved longitudinally, to receive the tracks 52. The carriage 54 is secured upon the tracks 52 for sliding move ment, by means of angle members 56 which, being secured to the carriage 54, engage beneath the tracks 52, as clearly shown in Fig. 1. Referring particularly to Fig. 2, one of the end bars 55 of the carriage 54 is provided with a bearing 57 into which the lead screw 37 is threaded, movement thus being imparted to the carriage, by the lead screw.

Supported by the carriage 54 and located adjacent the tail stock 3 are bearings 58, in which is journaled a shaft 59 provided with beveled pinions 60, meshing into beveled pinions 61 carried by lead screws 62 journaled for rotation in bearings 63 which are attached to the side bars 53 of the carriage.

The side bars 53 of the carriage 54 are'provided with tracks 64 upon which are dove-' tailed for slidin movement, base members 65, the base mem ers 65 being provided with outstanding lugs 66, into which the lead screws 62 are threaded. Posts 67 and 68 aromas. a

are superposed upon the base, members 65 and are Secured thereto as indicated at 69. The base members 65 and the posts 67 and 68 constitute supplemental stocks upon which the gear-blank'is supported during the cutting operation.

When rotary movement is imparted to the shaft 59, the intermeshing beveled pinions 60 and 61 will actuate the lead screws 1 62, the lead screws, being engaged with the lugs 66 of the base members 65, serving .to advance the posts 67 and 68 of the supplemental stocks, toward and away from the auxiliary stock 31 and the tail stock 3. A

clutch 59 is interposed in the shaft 59, so

' that the posts 67 and 68 may be moved independently.

The post 67 of one supplemental stock is provided wlth a lug 70 in which is jour 2Q naled a screw 71 threaded into a projection 72 upon a support 73, the support 73 being slidably engaged with guides 74L upon the post 67. By manipulating the screw v71, the support 73 may be raised and lowered.

2-5 Mounted in the support 73 is a center 75, actuated by a wedge 76 which is slidable Within the support 73. Sliding movement is imparted to the wedge 76 by means of a screw 77 which is operatively connected with the support 73 and with the wedge 76. The post 68 of the other supplemental stock is provided with a lug 78 receiving for rotation a screw 7 9 which is threaded into a projection 80 formed upon a support 81, ythe support 81 being slidably engaged with guides 82 formed upon the post 68. Obviously, the screw 79 constitutes a means whereby the support 81 may be raised and lowered. 4o center 83 carrying a large gear wheel 84, meshing into a smaller'geanwheel 85, the gear wheel 85 being secured to a shaft 86 which is journaled 1n a bearing 87 secured to the support 81.

The gear-blank which is to be cut is held between the centers 75 and 83. In order that the gear-blank may be connected to the center 83 for simultaneous rotation therewith,

a clamp member 88 is provided,'the same being shown in detail in Figs. '3 and 12. The clamp, member 88 is provided with an opening the arms 90 of the clamp being compressed by a screw 91. The space 92 which exists between the arms 90 is adapted to receive the lug L which is commonly formed upon the gear blank B. Thus, the gear blank is operatively connected with the center 83, so that when the center 83 is rotated, the gear blank will be rotated likewise. Rotatory movement is'imparted to the center 83 and to the gear blankthrough the medium of the shaft 86 and the intermeshing gear wheels 84 and 85. When the ear blank is rotated the manner hereinbef ore set forth,

screws 62 and the shaft 59.

Journaled in the support 81 is a 89 which receives the center 83,-

acc s i e p t n of, h P phery f he gear-blank are advanced into the path of the cutting tOOl, Which is indicated conventionally by the reference characters.

The, operations of the several constituent portions of the machine have been dealt with hereinbefore, but a brief rsum of the operation, generally considered, will be given.

The gear-blank is mounted upon the eel I ters and 83 of the supplemental stocks 67 75 and 68. The stocks 67 and 68 are positioned properly, longitudinally of the carriage 54, through the medium of the lead When the shaft 29 is actuated, the worm 50, the worm wheel 49, the shaft 46, the shaft 11) and the lead screw 37 will impart sliding movement to the carriage 54. Thus, the gear blank which is supported upon the carriage through the medium of the centers 75 and 83 of the supplemental stocks 67 and 68 will be advanced against the cutting tool, one side of a tooth in the gear blank being thus formed. The width of the tooth may be regulated by rotating the gear blank through the medium 9) of the center 83, the gear wheels 84 and 85 and the shaft 86, the other side of the tooth being out upon the next succeeding movement of the carriage 54;.

From the foregoing, it will be seen that 95 there is presented herein, a simple attachment, adapted to be assembled with a lathe, of any construction, for the purppse of gear cutting.

1. In a device of the class described, pa ks; a arr age mou ted s id upon the stocks; supplemental work holding stocks located uponthe carriage, a shaft supported for rotation independent]yv of the. carriage; and a gear train operatively connecting the shaft'with the carriage. to secure a sliding movement of the carriage,

2. In a device 'of the class described, 11,}; spaced stocks; a carriage mounted to slide. on the stocks; supplemental work holding stocks mounted to slide on the, carriage M an angle to the line of movement of the carns means for i ng the supple ent l lastocks upon the carriage; a shaft gournaled. for rotation independently of the, catch e; and a gear train connecting. the shaft with. the carriage to impart sliding movement to, the carriage.

3. In a device of the, class described, spaced stocks; a carriage. mounted to' slide upon the stocks; supplemental stocks mounted to slide upon the carriage at an angle to the line of movement of the car- 12 riage; means for'sliding the supplemental stocks upon the carriage; means for impart mg sliding movement to the carriage; centers mounted upon the stocks forniovement thus described the invention, what 10a at an angle to the direction of movement of 13p the carriage; and means for moving the centers. 1

4. The combination with the head and tail stocks of the lathe, of a shaft journaled therein; an auxiliary stock located between said lathe stocks; a carriage mounted to slide upon the auxiliary stock and upon one lathe stock; a work holder on the carriage; and a gear train supported by the auxiliary stock and operatively connecting the carriage with the shaft.

5. The combination with the head and tail stocks of a lathe, of a shaft journaled therein; an auxiliary stock located between the lathe stocks; a carriage mounted to slide upon the auxiliary stock and upon one lathe stock; a gear train supported by the auxiliary stock and operatively connecting the carriage with the shaft; a work holder mounted to slide upon the carriage, longitudinally of the shaft; and means for sliding the work holder longitudinally of the shaft.

6. The combination with the head and. tail stocks of a lathe and a center movable upon the tail stock, of a shaft engaged with the center and with the head stock; means for moving the center; a carriage mounted to slide transversely of the shaft; a work holder upon the carriage, and means for operatively connecting the carriage with the shaft.

7. The combination with the head and tail stocks of a lathe, of a shaft journaled in the head stock; movable means upon the tail stock for receiving one end of the shaft; an auxiliary stock located between the lathe stocks; a carriage mounted to slide upon the auxiliary stock and upon one lathe st ck; a work holder upon the carriage; and a gear train operatively connecting the shaft with the carriage, a portion of the gear train being located upon the shaft and a portion of the gear train being located upon the auxiliary stock for movement toward and away from that portion of the gear train which is located upon the shaft.

8. In a device of the class described, a head stock; a tail stock comprising space postsand a bar extended between the posts; means upon the posts for raising and lowering the bar; a center carried by the bar; a shaft engaged by the center and by the head stock; a carriage supported for slidmg movement; a work holder upon the carriage; and agear train operatively connecting the carriage with the shaft 9. In a device of the class described, a head stock; a tail stock comprising spaced posts having openings; guides mounted to slide in the openings; a bar connected with the guides; screws threaded into the guides and journaled in the posts; a shaft supported by the posts; means for connecting the shaft with the screws; a center carried by shaft; and a work holder upon'the carthe bar; a shaft j ournaled for rotation in the head stock and supported by the center; a carriage supported for sliding movement; a gear train connecting the carriage with the riage. t

10. In a device of the class described, spaced stocks; a carriage mounted to slide 'upon the stocks; a work holder upon the carriage; supplemental work holding stocks slidable upon the carriage at an angle to the line of movement of the carriage; lead screws journaled on the carriage and having threaded connection with the supplemental stocks; a shaft journaled upon the carriage and operatively connected with the lead screws; anda gear train supported by one stock and operatively connected with the carriage to impart sliding movement to the carriage.

11. In a device of the class described, spaced stocks; a 'carriage mounted to slide upon the stocks; supplemental stocks mounted to slide upon the carriage; means for sliding the carriage; means for sliding the supplemental stocks on the carriage; a center carried by one stock; a center rotatable in the other stock; a gear Wheel fixed to the last specified center; and a gear wheel,meshing into the first specified gear wheel, and supported for rotation by the stock which carries the rotatable center. I

12. In a device of the class described, spaced stocks; a carriage mounted to slide on the stocks; means for sliding the carriage; supplemental stocks mounted to slide on the carriage at an angle to the line of movement of the carriage; supports adjust able upon the supplemental stocksat right angles to the direction of movement of the carriage; centers carried by the supports; means for actuating one center along its longitudinal axis and means for rotating the other'center.

13. In a device of the class described, spaced stocks; a carriage mounted to slide upon the stocks; a work holder on the carriage; a drive shaft supported for rotation independently of the carriage; aworm upon the drive shaft; a worm wheel supported for rotation by one stock and meshing into the worm; a lead screw journaled on said stock and threaded into the carriage; a shaft wit-h which the worm wheel is connected; and a shaft operatively connecting the last specified shaft with the lead screw.

14." In a device of the class described, spaced stocks; a carriage mounted to slide on the stocks; a work holder on the carangle to the line of movement of the carthe carriage; a worm upon the shaft; :1 bearing vertically adjustable upon one stock; a worm wheel supported for rotation by the bearing and meshlng into the worm; a lead screw journaled on said stock and operatively connected with the carriage; and as my own, I have hereto afixed my signs an extensible, opegatlzive connectlzion between ture in the presence of two witnesses. the lead screw an t e Worm W eel, permit- 2 i ting a shifting of the position of the bear- ART BERGERON' 5 ing and permitting a change in the relative Witnesses: positions of the Worm and the Worm Wheel. JULIUS E. JQHNsON,

In testimony that I claim the foregoing RENE BERGERON. 

